Before trying testdisk does the above screenshot seem to suggest trying something else first?
Not to me, I find that utterly baffling
Now you see it, now you don't partitions are beyond my comprehension. That is why I speculated it might be a problem with the caddy or its connection to your machine. You could possibly investigate that by opening a terminal and running the command
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tail -f /var/log/syslog
Leave the terminal open and then try doing something to your external drive (connecting to it, formatting it, whatever you can think of) none of that will work of course, but if the connection to the caddy is broken you might get output from the terminal (you certainly would if you connected/disconnected a usb key for example).
If that shows nothing testdisk is my last shot.
BTW it is Ctl/c to stop the terminal command.
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).